Show Error if Dates dont follow proper logic

[TesDA]

I'm just not sure where to start on this since I'm a newbie in powerapps.

I have two dates that the user is prompted to enter: DateCardStart, DateCardEnd

How do I require that DateCardEnd is always >= DateCardStart?

[RandyHayes · Accepted solution]

One easy way is to unlock one of your Date dataCards in your Edit form and then modify the ErrorMessage control.

In that control, first, change the text to the error you want to display.

Then, change the Visible property and put in your logic there.

Something like:

   (DataCardValue13.SelectedDate>=DataCardValue15.SelectedDate)

This will return a true or false depending on the values and thus govern if the Error Message is displayed.

You can also tie this to your Submit button to disable it (DisplayMode) unless the information is valid.

Keep in mind that DataCards in a form all contain at least 4 controls:

   StarVisible - This is the "required" field indicator

   ErrorMessage - This is the label that has error text in it.

   DataCardVale - a control (based on the underlying data type) where the value is displayed, edited or otherwise used.

   DatCardKey- The label that shows the name of the field.

You can always unlock and work with them on your own, or create your own.

Hope this helps some.

[rebeccas]

What I would do for this is create a label that says that says lets them know "End date must be equal to or greater than Start Date" or something to that effect.

For the OnVisible of the Label put =If(DateEnd.SelectedDate>=DateStart.SelectedDate,false, true)

Then wherever the click to submit the form make it disabled if that label is visible.

You could use the same concept but make a fill color or text color or something else but I find labels to be best bet for users.